Demand response users (which I believe means "The Ride", here in Boston) pay just 4.14% of the cost of their rides.

The MBTA reports this information[5], too (Page 12). Although it's from 2009, the report I found details how the T compares to other major US transit systems when it comes to cost recovery.

Heavy rail users in Massachusetts appear to be paying just a bit more than riders in other states, at almost 54%, but light rail users are getting smacked, paying the highest percentage among six major metropolises. Ferry boat riders cover more than 60% of the cost of their rides, far and away the highest percentage, nationwide.